A solar model with improved subatmospheric stratification

The calculated intermediate and high degree p-mode frequencies of standard solar models show greater disagreement with the observations than low degree modes. This leads to the conclusion that the subatmospheric structure of the models has to be improved. We are presenting solar models with up-to-date input physics and controlled numerical accuracy of 10 5. For the outer boundary condition we use synthetic atmospheres fitted to the interior solution at 20. In addition, a spatially variable mixing length parameter has been employed to reproduce the pressure-temperature stratification of the outer convective zone calculated by 2D-hydrodynamical models we used for comparison. With this changed subatmospheric structure we could improve the agreement between predicted and observed p-mode frequencies in our solar models.